Your galaxy has been invaded by melodic celestial bodies, and you've been tasked to save it. So you must "Survive the Beat!" Absorb enemy bullets and fire it back at them, slow down time, upgrade your ship and level up.
Use WASD, Arrow keys, or numpad to move. Z, comma (for WASD) or SPACEBAR to shoot. X, period (for WASD) or SHIFT to slow time down.